Methods for treating the vasculature of solid tumors

The present invention relates generally to methods and compositions for targeting the vasculature of solid tumors using immunologically-based reagents. In particular aspects, antibodies carrying diagnostic or therapeutic agents are targeted to the vasculature of solid tumor masses through recognition of tumor vasculature-associated antigens, such as, for example, through endoglin binding, or through the specific induction of endothelial cell surface antigens on vascular endothelial cells in solid tumors.

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Claims

1. A method for treating a vascularized tumor, comprising administering to an animal having a vascularized tumor a biologically effective amount of a conjugate comprising a selected therapeutic agent linked to a targeting agent that binds to a marker expressed, accessible to binding or localized on the cell surfaces of intratumoral blood vessels of the vascularized tumor.

2. The method of claim 1, wherein the targeting agent is a monoclonal antibody or monoclonal antibody fragment.

3. The method of claim 2, wherein the antibody recognizes a tumor vascular endothelial cell marker that is expressed on the cell surfaces of intratumoral vascular endothelial cells and wherein the antibody or antibody fragment has little or no reactivity with the cell surface of normal endothelial cells.

4. The method of claim 3, wherein the antibody recognizes endoglin.

5. The method of claim 4, wherein the antibody binds to the same epitope as the antibody TEC-4 (ATCC HB-12312) or TEC-11 (ATCC HB-12311).

6. The method of claim 5, wherein the antibody is TEC-4 (ATCC HB-12312) or TEC-11 (ATCC HB-12311).

7. The method of claim 3, wherein the antibody recognizes ELAM-1.

8. The method of claim 3, wherein the antibody recognizes VCAM-1.

9. The method of claim 3, further comprising preparing the antibody by a method that includes the steps of:

(a) stimulating endothelial cells with tumor-conditioned medium;
(b) employing the stimulated endothelial cells as immunogens to prepare a collection of antibody-producing hybridomas;
(c) selecting from the collection a hybridoma that produces an antibody that recognizes the activated vascular endothelium to a greater degree than it recognizes non-activated vascular endothelium; and
(d) culturing the hybridoma to provide the antibody.

10. The method of claim 3, wherein the antibody recognizes a marker whose expression on the surface of the intratumoral vascular endothelial cells is cytokine-inducible.

11. The method of claim 10, wherein the antibody recognizes ELAM-1, VCAM-1, ICAM-1, a ligand reactive with LAM-1, endoglin or an MHC Class II antigen.

12. The method of claim 11, wherein the antibody recognizes an MHC Class II antigen.

13. The method of claim 11, wherein the antibody recognizes ELAM-1.

14. The method of claim 11, wherein the antibody recognizes VCAM-1.

15. The method of claim 10, wherein the antibody recognizes an endothelial cell marker that is inducible by the cytokine IL-1, IL-4, TNF-.alpha., TNF-.beta. or IFN-.gamma..

16. The method of claim 10, wherein the antibody recognizes an endothelial cell marker that is inducible by means of a cytokine released by leukocyte cells of the patient.

17. The method of claim 16, wherein the leukocyte cells are monocytes, macrophages, mast cells, helper T cells, CD8-positive T-cells or NK cells.

18. The method of claim 11, further comprising administering an antitumor antibody-therapeutic agent conjugate to the animal.

19. The method of claim 18, wherein the antitumor antibody comprises an HMFG-2, SM-3, B72.3, PR5C5, PR4D2, 9.2.27, OV-TL3, MOv18 or anti-p185.sup.HER2 antibody or antibody fragment.

20. The method of claim 1, wherein the animal is a human cancer patient.

21. The method of claim 2, wherein the antibody is linked to an anticellular agent capable of killing or suppressing the growth or cell division of endothelial cells.

22. The method of claim 21, wherein the anticellular agent comprises a chemotherapeutic agent, radioisotope or cytotoxin.

23. The method of claim 22, wherein the anticellular agent comprises a steroid, a cytokine, an antimetabolite, an anthracycline, a vinca alkaloid, an antibiotic, an alkylating agent or an epipodophyllotoxin.

24. The method of claim 22, wherein the anticellular agent comprises a plant-, fungus- or bacteria-derived toxin.

25. The method of claim 24, wherein the toxin comprises an A chain toxin, bacterial endotoxin, the lipid A moiety of bacterial endotoxin, a ribosome inactivating protein,.alpha.-sarcin, aspergillin, restrictocin, a ribonuclease, diphtheria toxin or Pseudomonas exotoxin.

26. The method of claim 25, wherein the toxin comprises deglycosylated ricin A chain.

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Patent History
Patent number: 5855866
Type: Grant
Filed: Mar 2, 1994
Date of Patent: Jan 5, 1999
Assignee: Board of Regenis, The University of Texas System (Austin, TX)
Inventors: Philip E. Thorpe (Dallas, TX), Francis J. Burrows (Dallas, TX)
Primary Examiner: John Kight
Assistant Examiner: Michael G. Hartley
Law Firm: Arnold, White & Durkee
Application Number: 8/205,330
Classifications
Current U.S. Class: 424/149; 424/1781; 424/1561; 424/1831; 424/1421; 424/1551; 424/1811; 530/3917; 530/3919; 530/3871; 530/38815; 530/38822; 530/3888; 530/3913
International Classification: A61K 5110; A61K 39395; C07K 1600;